made hard coded choice for encryptions more flexible and disable parsing

src/main/java/eu/siacs/conversations/Config.java

@@ -6,13 +6,43 @@ import eu.siacs.conversations.xmpp.chatstate.ChatState;
 
 public final class Config {
 
+
+	private static final int UNENCRYPTED = 1;
+	private static final int OPENPGP = 2;
+	private static final int OTR = 4;
+	private static final int OMEMO = 8;
+
+	private static final int ENCRYPTION_MASK = UNENCRYPTED | OPENPGP | OTR | OMEMO;
+
+	public static boolean supportUnencrypted() {
+		return (ENCRYPTION_MASK & UNENCRYPTED) != 0;
+	}
+
+	public static boolean supportOpenPgp() {
+		return (ENCRYPTION_MASK & OPENPGP) != 0;
+	}
+
+	public static boolean supportOpenPgpOnly() {
+		return supportOpenPgp() && !multipleEncryptionChoices();
+	}
+
+	public static boolean supportOtr() {
+		return (ENCRYPTION_MASK & OTR) != 0;
+	}
+
+	public static boolean supportOmemo() {
+		return (ENCRYPTION_MASK & OMEMO) != 0;
+	}
+
+	public static boolean multipleEncryptionChoices() {
+		return (ENCRYPTION_MASK & (ENCRYPTION_MASK - 1)) != 0;
+	}
+
 	public static final String LOGTAG = "conversations";
 
 
 	public static final String DOMAIN_LOCK = null; //only allow account creation for this domain
 	public static final boolean DISALLOW_REGISTRATION_IN_UI = false; //hide the register checkbox
-	public static final boolean HIDE_PGP_IN_UI = false; //some more consumer focused clients might want to disable OpenPGP
-	public static final boolean FORCE_E2E_ENCRYPTION = false; //disables ability to send unencrypted 1-on-1
 	public static final boolean ALLOW_NON_TLS_CONNECTIONS = false; //very dangerous. you should have a good reason to set this to true
 	public static final boolean FORCE_ORBOT = false; // always use TOR
 	public static final boolean HIDE_MESSAGE_TEXT_IN_NOTIFICATION = false;

src/main/java/eu/siacs/conversations/entities/Conversation.java

@@ -673,11 +673,15 @@ public class Conversation extends AbstractEntity implements Blockable {
 				next = outgoing;
 			}
 		}
-		if (Config.FORCE_E2E_ENCRYPTION && mode == MODE_SINGLE && next <= 0) {
-			if (axolotlService != null && axolotlService.isContactAxolotlCapable(getContact())) {
+		if (!Config.supportUnencrypted()
+				&& (mode == MODE_SINGLE || Config.supportOpenPgpOnly())
+				&& next <= 0) {
+			if (Config.supportOmemo() && (axolotlService != null && axolotlService.isContactAxolotlCapable(getContact()) || !Config.multipleEncryptionChoices())) {
 				return Message.ENCRYPTION_AXOLOTL;
-			} else {
+			} else if (Config.supportOtr()) {
 				return Message.ENCRYPTION_OTR;
+			} else if (Config.supportOpenPgp()) {
+				return Message.ENCRYPTION_PGP;
 			}
 		}
 		return next;

src/main/java/eu/siacs/conversations/parser/MessageParser.java

@@ -3,7 +3,6 @@ package eu.siacs.conversations.parser;
 import android.util.Log;
 import android.util.Pair;
 
-import eu.siacs.conversations.crypto.PgpDecryptionService;
 import net.java.otr4j.session.Session;
 import net.java.otr4j.session.SessionStatus;
 
@@ -345,7 +344,7 @@ public class MessageParser extends AbstractParser implements
 				}
 			}
 			Message message;
-			if (body != null && body.startsWith("?OTR")) {
+			if (body != null && body.startsWith("?OTR") && Config.supportOtr()) {
 				if (!isForwarded && !isTypeGroupChat && isProperlyAddressed) {
 					message = parseOtrChat(body, from, remoteMsgId, conversation);
 					if (message == null) {
@@ -355,9 +354,9 @@ public class MessageParser extends AbstractParser implements
 					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": ignoring OTR message from "+from+" isForwarded="+Boolean.toString(isForwarded)+", isProperlyAddressed="+Boolean.valueOf(isProperlyAddressed));
 					message = new Message(conversation, body, Message.ENCRYPTION_NONE, status);
 				}
-			} else if (pgpEncrypted != null) {
+			} else if (pgpEncrypted != null && Config.supportOpenPgp()) {
 				message = new Message(conversation, pgpEncrypted, Message.ENCRYPTION_PGP, status);
-			} else if (axolotlEncrypted != null) {
+			} else if (axolotlEncrypted != null && Config.supportOmemo()) {
 				message = parseAxolotlChat(axolotlEncrypted, from, remoteMsgId, conversation, status);
 				if (message == null) {
 					return;

src/main/java/eu/siacs/conversations/services/XmppConnectionService.java

@@ -351,7 +351,9 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	}
 
 	public PgpEngine getPgpEngine() {
-		if (pgpServiceConnection != null && pgpServiceConnection.isBound()) {
+		if (!Config.supportOpenPgp()) {
+			return null;
+		} else if (pgpServiceConnection != null && pgpServiceConnection.isBound()) {
 			if (this.mPgpEngine == null) {
 				this.mPgpEngine = new PgpEngine(new OpenPgpApi(
 						getApplicationContext(),
@@ -689,6 +691,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		getContentResolver().registerContentObserver(ContactsContract.Contacts.CONTENT_URI, true, contactObserver);
 		this.fileObserver.startWatching();
 
+		if (Config.supportOpenPgp()) {
 			this.pgpServiceConnection = new OpenPgpServiceConnection(getApplicationContext(), "org.sufficientlysecure.keychain", new OpenPgpServiceConnection.OnBound() {
 				@Override
 				public void onBound(IOpenPgpService2 service) {
@@ -700,9 +703,11 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 				}
 
 				@Override
-			public void onError(Exception e) { }
+				public void onError(Exception e) {
+				}
 			});
 			this.pgpServiceConnection.bindToService();
+		}
 
 		this.pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
 		this.wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "XmppConnectionService");

src/main/java/eu/siacs/conversations/ui/ConversationActivity.java

@@ -408,9 +408,10 @@ public class ConversationActivity extends XmppActivity
 					menuContactDetails.setVisible(false);
 					menuAttach.setVisible(getSelectedConversation().getAccount().httpUploadAvailable() && getSelectedConversation().getMucOptions().participating());
 					menuInviteContact.setVisible(getSelectedConversation().getMucOptions().canInvite());
-					menuSecure.setVisible(!Config.HIDE_PGP_IN_UI && !Config.X509_VERIFICATION); //if pgp is hidden conferences have no choice of encryption
+					menuSecure.setVisible(Config.supportOpenPgp() && Config.multipleEncryptionChoices()); //only if pgp is supported we have a choice
 				} else {
 					menuMucDetails.setVisible(false);
+					menuSecure.setVisible(Config.multipleEncryptionChoices());
 				}
 				if (this.getSelectedConversation().isMuted()) {
 					menuMute.setVisible(false);
@@ -849,9 +850,10 @@ public class ConversationActivity extends XmppActivity
 			MenuItem none = popup.getMenu().findItem(R.id.encryption_choice_none);
 			MenuItem pgp = popup.getMenu().findItem(R.id.encryption_choice_pgp);
 			MenuItem axolotl = popup.getMenu().findItem(R.id.encryption_choice_axolotl);
-			pgp.setVisible(!Config.HIDE_PGP_IN_UI && !Config.X509_VERIFICATION);
-			none.setVisible(!Config.FORCE_E2E_ENCRYPTION || conversation.getMode() == Conversation.MODE_MULTI);
-			otr.setVisible(!Config.X509_VERIFICATION);
+			pgp.setVisible(Config.supportOpenPgp());
+			none.setVisible(Config.supportUnencrypted() || conversation.getMode() == Conversation.MODE_MULTI);
+			otr.setVisible(Config.supportOtr());
+			axolotl.setVisible(Config.supportOmemo());
 			if (conversation.getMode() == Conversation.MODE_MULTI) {
 				otr.setVisible(false);
 				axolotl.setVisible(false);

src/main/java/eu/siacs/conversations/ui/ManageAccountActivity.java

@@ -123,7 +123,7 @@ public class ManageAccountActivity extends XmppActivity implements OnAccountUpda
 			menu.findItem(R.id.mgmt_account_publish_avatar).setVisible(false);
 		} else {
 			menu.findItem(R.id.mgmt_account_enable).setVisible(false);
-			menu.findItem(R.id.mgmt_account_announce_pgp).setVisible(!Config.HIDE_PGP_IN_UI);
+			menu.findItem(R.id.mgmt_account_announce_pgp).setVisible(Config.supportOpenPgp());
 		}
 		menu.setHeaderTitle(this.selectedAccount.getJid().toBareJid().toString());
 	}